In face of _______ failure, it’s important for us to keep ________ good state of mind.
—Are my clothes too casual? —No. You can go ____you are.
How ___I help them to understand when they won’t listen to me?
In summer, food will go bad if________in room temperature.
QQ, you can chat with your friends, makes communication easy.
Mike must be angry with me, for he walked me without even saying hello.